During construction of the rig, all aspects of building and construction works were monitored and certified by Shipping & Department of Energy, Lloyds Register. Throughout its working life, the rig has been very well maintained with an on-going preventive maintenance schedule. It had been upgraded and completely overhauled on three occasions: firstly in 1985, then in 1993 and again in 1996. It also had been completely stripped-down and fully refurbished at the Myanmar Shipyards in 2007.
In 2008, the Rig AD-1 was upgraded and commissioned with New Gensets, SCR and Mud Pumps at MOGE offshore supply base in Myanmar.